Improved ore-boasting furnace



(a. B. FIELD.

Ore Roasten, No. 67,862. Patented Au 20,1867.

Witnesses= Inventor,

AM. PHOTO-LITHO.C0.NX. (OSEORNE'S PROCESS.)

gums gtatrs igatmt @ffirc.

GEOR G E B. FIELD, OF NElV YORK, N. Y

Letters fatent l\o. 67,862, dated August 20, 1867.

IMPROVED 0RE;ROASTING FURNACE.

TO ALL. WHOM IT MAY GONCERNz Be it known that I, GEORGE B. FIE'LD, 0 the city, county, and State of New York, have invented a new and improved Ore-Roasting Furnace; and I do hereby-declare the following to he a full, clear, and exact description of the same, reference being bad to the accompanying drawings, forming part of. this specification, and in which- I v Figure 1 represents a perspective view of" my invention.

Figure 2 shows a cross-section of the same through the centre of the fines e e 2.

Figure 3 represents apeculiar form of plate F. V i

Similar letters ofreference indicate corresponding parts in the-several figures. I

This invention relates to ore-roasting and'desulphurizing furnaces, provided with an attachmenti'or agitat ing' the ores while roasting. i I i The invention consists in making the various parts of such attachment hollow or tubular for the admission of steam or water to keep them from being destroyed by the intense heat to which they are subjected.

In order that others skilled in the art to which my invention appertains may-be enabled to make and use the same, I will proceed to describe it in detail.

In the drawings, A A represent the cylinder, within which the ores are roasted, B being the neck or tube where it joins the furnace, and ,throughwhich itreceives its heat in the commencement'of the desulphurizingprocess, and 0 being the pipe through which the smoke,-gases, and steam pass to the'chimney after doing their work. The sides of the cylinder A are lined with fire-brick to preveuttheir destruction by heat. One end,'D, of the cylinder, next tofthe i'urnace, is a circular plate, lined with fire-brick, and having a circular aperture, (L in its centre. Suspended in the centre of this aperture, upon four or more radii d'id, attached to theplate D, is the hub or jomna-pbox Theradii d d are inade hollow, to better protect them from being destroyed by the fire. The opposite end of the cylinder is formed into aseparate compartment, A-, 'by means of the plates E E, and

serves the purpose of a steam and water-chest. Flues e e 2 pass through it, permitting the escape of'the vapors ofcombustion i'r om the fire-chamber of the cylinder to the smoke pipe 0. In the interior of the firechamber A is a hollow plate-rake or shelf, F, of iron or other suitable material, bolted firmly to the cylinder, and connected at one end to the tube G which passes through and bears in the hub d, and is connected with a reservoir oi water, and having its other end connected with the steam and water-chest Aby means of the tubes G Gr- I i i I In working an apparatus of this kind the process is to placethe ores in the fire-chamber A, and connect this chamber at B with the furnace. For awhile the assistance of the furnace will be required, but as the heat in the chamber A begins to vaporize the sulphurofthe ores, the latter will take fire and burn with an intense heat, quite sufficient for the remainder of the process, and the furnace may now be disconnected from the cylinder. Meanwhile, by means of a.pump or other suitable apparatus, the plate "F, tubes G and G G, and the lower portion of the chamber A, have been filled with water,-and the cylinder, with itsenclosed apparatus, (if it is a rotary furnace,) has been made to revolve by means 'of-machinery not necessary here to be described; -As it revolves, the outer extremities of thepipes G G alternately pass under and overv'the water in the lower part of the-chamberA, and any steam thatmay be generated within them, or within the plate' F cr'tube G, will collect in the upper part of thechamber A, from which it is carried to the smoke stack by means of the pipe H. -The latter enters the head of the cylinder E at its centre, and bends upward to some distance to prevent the escape of the water from the chamber, and insure only the escape of the dry steam. The pipe H has to be fixed in order to maintainthe upright position of its bent extremity within the chamber A, and therefore must be suitably packed Where it passes through the plate E. The end of the tube G that is Q'ttached to the reservoir must, of course, be stationary, while the opposite end attached to the cylinder must revolve. .To admit this I provide a suitable joint at y, where the revolving extremity of tube G may be made to fit into and bear. in the fixed extremity of the same tube. An apparatus of this kind'being in operation, the steam generated in any part of the interior pipes of the hollow plate F willpass freely to the chimney, while the water contained in the same parts will be held there in any required quantity. By this means the tubes and the plate F will be constantly cooled, and will be able to withstand the great heat of the fire-chamber for an indefinite time. To further utilize the heat of the chamber A',a bent tube or'steam-generator, K, may be attached to the plate E, and may be placed in any suitable position inside of the fire-chamber. By placing the tines a e e around the edge of the plate'E, and then attaching the tube K in front of them, closely convoluting it, as shown in the drawing, but leaving-a suflieient open space in the centre, as shown at k, the escaping flameand smoke may be made to pass through the aperture Ia, and between the convolutions, and then across the sections of tube on their rear side to the outlet'fiues e at, thoroughly heating the water or superheating the steam in the pipe K. The steam thus generated, as well as the steam generated iiithe plate F and its attached tubes,.may be used for heating the air in buildings, or for operating a steam engine about the establishment, if conveyed to it by the pipe H instead of being allowed to escape up the smo ke'stacka I do not intend to confine myself to any particular shape of the parts herein described, except in case of the tube H with its bent extremity, but may use anyform of construction that will answer my purpose. Espe I (daily I do not wish to limit myself to the particular form of the plate F, shown in the drawing, but mean to use anyform of plates, shelves,-or agitatorsfor the manipulation of the ores. My invention does not consist in any particular outward form of these parts, but in making them hollow for the admission of water, for the purposes set forth, and, whatever form may be used or patented by others, I desire to secure to myself the exclusive right to make the parts hollow for the admission of water or steam, Ialso desire to secure to myself the exclu' si-ve' right to use, as a motive power, or 'for. regulating the temperature of the air, the" steam and water in the hollow'apparatus which may be adopted. 1 do not desire to limit myself to the rake, shelf, or agitating apparatus fixed to and revolving with the cylinder A, but desire to be at liberty to use, if I prefer it, a fixed and stationary rake, shelf, or agitator, F, inside of a revolving or stationary cylinder, A.

"The plate F may be made, if thought best, in the form shown in fig. 3, an ellipse, having the central slot F acro ss which the pipes connect two sides of which it is composed.

* Having thus described my invention, what'I claim as new, and desire to secure by Letters Patent, is-

1.. The tube G, in conection with the agitating apparatus, substantially as and for the purpose described. 2. The eduction'pipe H, having its extremity bent upward, substantially as and for the purpose specified. 3. The introduction of, water or steam inside of hollow shelves, rakes, or agitators, for the stirringor manipulating of ores in ore-roasting furnaces, substantially as and for the purpose-specified.

4. Theintroduotion of steam-generators in the inside of roasting-furnaces, for the purposes specified. GEO. 13. FIELD.

Witnesses: 7

CHARLES A. PETTIT, SoLoN C. ,Knuou. 

